Ah, OK clear, So if I want to be able to switch between master and slave I need a 2 channel DOM.
Not exactly clear how two channel drives work. But my guess is that two channel DOMs are divided in two. lets say 2X2 GB... Master and slave.
I would stick with one channel drives....
And my experience is that the DOMs do not enjoy sharing a channel on the ide bus. I only have single channel DOM, but making them (the two i have tried) to work with other IDE equipment in the same channel is difficult.